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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5894457393a5b52336a839cf3079273ce57307b634447781f610f3b3de53424c' 
  AND token = 'PVC/Wq0ky7FtFX1GD55mq25kyChQDL+8ELSrkBSjx5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}